N. B. (1) :

Reference to Art. 57 and Art. 58

1. Any vessel escorted by one tug and the situation requires another imposed tug, same tug is considered imposed needless for a second tug.
   
2. Any vessel escorted by two tugs and the situation requires a third imposed tug, one of the two escorting tugs will be for escort and the second is imposed needless for a third tug.